1School of Precision Instrument and Opto-electronics Engineering, Tianjin Optical Fiber Sensing Engineering Center, Institute of Optical Fiber Sensing of Tianjin University, Key Laboratory of Opto-electronics Information Technology, Tianjin University, Tianjin 300072, China
2School of Electrical and Electronic Engineering, Engineering Research Center of Optoelectronic Devices and Communication Technology, Ministry of Education, Tianjin Key Laboratory of Film Electronic and Communication Devices, Tianjin University of Technology, Tianjin 300384, China